A Y-branch type phase-change all-optical Boolean logic device comprises a waveguide of a Y-branch structure and phase change function units covered over the waveguide. In the logic implementation method, a light pulse having a large power is employed to perform a write operation on the phase change function unit, so that the phase change function unit is heated to generate a crystallization or amorphization phase change, thereby causing a difference in optical properties under two states; the state of the phase change function unit is read by employing a light pulse having a small power, and the state of its phase change material is not changed. By defining input logic signals respectively and defining three operation steps, an operation mode reconfigurable logic can be implemented, and all 16 binary Boolean logic calculations are implemented in a simple structure by means of step-by-step operation.

Photosensitive logic cell on a semiconductor-on-insulator substrate, possessing a P type transistor and an N type transistor fabricated on the front face of the substrate and whose respective threshold voltages can be modulated according to the quantity of photons received by a photosensitive zone provided opposite these transistors, the photosensitive zone possessing a photo-detection region whose arrangement is such that it favours illumination by the face of the photosensitive zone.

Techniques for coupling light into graphene using a planar photonic crystal having a resonant cavity characterized by a mode volume and a quality factor and at least one graphene layer positioned in proximity to the planar photonic crystal to at least partially overlap with an evanescent field of the resonant cavity. At least one mode of the resonant cavity can couple into the graphene layer via evanescent coupling. The optical properties of the graphene layer can be controlled, and characteristics of the graphene-cavity system can be detected. Coupling light into graphene can include electro-optic modulation of light, photodetection, saturable absorption, bistability, and autocorrelation.

An example optical system having an electro-optical (EO) logic gate connected to a controller is presented. The controller modulates a first encoded electrical signal and a second encoded electrical signal based on an operation selection input. The EO logic gate includes a first Mach Zehnder interferometer (MZI) coupled between an optical input port and an optical output port; a second MZI optically coupled in parallel with the first MZI; a first phase shifter adjacent to the first MZI and; and a second phase shifter adjacent to the second MZI. The phase shifters apply phase shifts to the optical signals propagating via the first and second MZIs based on the modulated first encoded electrical signal and the modulated second encoded electrical signal to cause an optical output at the optical output port to vary based on the logic operation of the first encoded electrical signal and the second encoded electrical signal.

A memory device may include an access transistor, and a memory cell configured to store an item of information. The memory cell may include first and second electrodes configured to have different optoelectronic states corresponding respectively to two values of the item of information, and to switch between the different optoelectronic states based upon a control signal external to the memory cell, the different optoelectronic states being naturally stable in an absence of the control signal. The memory cell may also include a solid electrolyte between the first and second electrodes.

This disclosure relates to optical devices for quantum information processing applications. In one example implementation, a semiconductor structure is provided. The semiconductor structure may be embedded with single defects that can be individually addressed. An electric bias and/or one or more optical excitations may be configured to control the single defects in the semiconductor structure to produce single photons for use in quantum information processing. The electric bias and optical excitations are selected and adjusted to control various carrier processes and to reduce environmental charge instability of the single defects to achieve optical emission with wide wavelength tunability and narrow spectral linewidth. Electrically controlled single photon source and other electro-optical devices may be achieved.

Circuits and methods that implement multiplexing for photons propagating in waveguides are disclosed, in which an input photon received on a selected one of a set of input waveguides can be selectably routed to one of a set of output waveguides. The output waveguide can be selected on a rotating or cyclic basis, in a fixed order, and the input waveguide can be selected based at least in part on which one(s) of a set of input waveguides is (are) currently propagating a photon.

An example optical system having an electro-optical (EO) logic gate connected to a controller is presented. The controller modulates a first encoded electrical signal and a second encoded electrical signal based on an operation selection input. The EO logic gate includes a first Mach Zehnder interferometer (MZI) coupled between an optical input port and an optical output port; a second MZI optically coupled in parallel with the first MZI; a first phase shifter adjacent to the first MZI and; and a second phase shifter adjacent to the second MZI. The phase shifters apply phase shifts to the optical signals propagating via the first and second MZIs based on the modulated first encoded electrical signal and the modulated second encoded electrical signal to cause an optical output at the optical output port to vary based on the logic operation of the first encoded electrical signal and the second encoded electrical signal.